Morning Market Losers

Intuitive Surgical (NASDAQ: ISRG) shares tumbled 8.04% to $450.45 after the company issued downbeat revenue forecast for the first-quarter. The company expected revenue of around $465 million, versus analysts' estimates of $535.5 million. Sterne Agee initiated coverage on the stock with an Underperform rating.

Mistras Group (NYSE: MG) shares fell 7.71% to $20.47 after the company reported downbeat Q3 earnings and lowered its FY14 EBITDA forecast

WD-40 Company (NASDAQ: WDFC) slipped 5.58% to $73.48 after the company reported weaker-than-expected FQ2 earnings.

Ashford Hospitality Trust (NYSE: AHT) shares declined 5.45% to $10.59 after the company priced 7.5 million shares at $10.70 per share.

Walter Energy (NYSE: WLT) fell 4.55% to $7.97 after UBS downgraded the stock from Neutral to Sell.

Alpha Natural Resources (NYSE: ANR) shares slipped 4.30% to $4.67 after UBS downgraded the stock from Neutral to Sell.

Relypsa (NASDAQ: RLYP) slipped 2.68% to $26.50 after the company announced a proposed public offering of $80 million in common stock.

Halozyme Therapeutics (NASDAQ: HALO) shares dropped 2.04% to $8.12 after the company reported a clinical hold of PEGPH20 pancreatic cancer trial amid voluntary halt.

General Motors Company (NYSE: GM) shares fell 2.03% to $33.83 as the company as has been fined $28 thousand by NHTSA for failing to respond to some requests.

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